SpriteKit

GameScene.swift

import SpriteKit
import GameplayKit

class GameScene: SKScene {

    override func didMove(to view: SKView) {

        let frequency: Double = 1.0
        let sampleCount: Int32 = 16
        let mapSize: Double = 5
        
        let noiseSource = GKRidgedNoiseSource(
            frequency: frequency,
            octaveCount: 3,
            lacunarity: 2.7,
            seed: 0)
        
        let noise = GKNoise(noiseSource)
        noise.gradientColors = [
            -1.0 as NSNumber : NSColor(red: 0.1, green: 0.1, blue: 0.1, alpha: 1.0),
            1.0 as NSNumber  : NSColor(red: 0.5, green: 0.5, blue: 0.9, alpha: 1.0)
        ]
        
        var noiseMap = GKNoiseMap(noise,
                                  size: double2(mapSize,mapSize),
                                  origin: double2(0.0, 0.0),
                                  sampleCount: int2(sampleCount,sampleCount),
                                  seamless: false)
        
        var noiseTexture = SKTexture(noiseMap: noiseMap)
        var spriteNode = SKSpriteNode(texture: noiseTexture, size: CGSize(width: 256, height: 256))
        
        spriteNode.position = CGPoint(x: frame.midX, y: frame.midY)
        
        addChild(spriteNode)
        
        noiseMap =     GKNoiseMap(noise,
                                  size: double2(mapSize,mapSize),
                                  origin: double2(21.0, 0.0),
                                  sampleCount: int2(sampleCount,sampleCount),
                                  seamless: false)
        
        noiseTexture = SKTexture(noiseMap: noiseMap)
        spriteNode = SKSpriteNode(texture: noiseTexture, size: CGSize(width: 256, height: 256))
        
        spriteNode.position = CGPoint(x: frame.midX + 256, y: frame.midY)
        
        addChild(spriteNode)
    }
    
    
    override func mouseDown(with event: NSEvent) {
        
    }
    
    override func update(_ currentTime: TimeInterval) {
        // Called before each frame is rendered
        
    }
}

ViewController.swift

import SpriteKit
import GameplayKit

class ViewController: NSViewController {

    @IBOutlet var skView: SKView!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        if let view = self.skView {
            // Load the SKScene from 'GameScene.sks'
            let scene = GameScene()
            // Set the scale mode to scale to fit the window
            scene.scaleMode = .resizeFill
            scene.size = view.bounds.size
            // Present the scene
            view.presentScene(scene)
            
            view.ignoresSiblingOrder = true
            view.preferredFramesPerSecond = 1
            view.showsFPS = true
            view.showsNodeCount = true
        }
    }
}